کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1486475 991685 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetic vs. thermodynamic control of crystal nucleation and growth in molten silicates
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Kinetic vs. thermodynamic control of crystal nucleation and growth in molten silicates
چکیده انگلیسی

A series of calcium aluminosilicate liquids have been experimentally heat-treated at high but variable states of undercooling, from just above the glass transition to the vicinity of the solidus. The mineralogy and chemistry of crystalline phases which appear in these experiments have been quantified using a combination of Transmission Electron Microscopy and Raman spectroscopy. The results show that mineral compositions are highly variable as a function of temperature, but that changes are governed by the contrasting and strongly temperature-dependent mobilities of network-modifying and network-forming cations. Whereas equilibrium crystals form near the liquidus, disordered and non-stoichiometric phases precipitate near the glass transition. Despite this apparently complex situation, the relative importance of thermodynamic and kinetic factors is found to be a single function of T − Tg (where T is temperature and Tg the glass transition temperature), regardless of the silicate composition. The existence of this mastercurve may be used to control the composition of novel composite materials such as glass ceramics.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issue 2, 1 February 2006, Pages 180–184
نویسندگان
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